Back in the 1990s there was an epic 12' tall, 24' wide, masonite vert ramp in Ellensburg, Washington.
There's a 2020 article about the ramp.
Check out these pictures that Danny Woodall (who now skates SVR with us) sent me:
Check out the oververt extension in these pictures.
"The oververt was super gnarly. Initially we just rolled the masonite over the coping, but I think those images show it after we cut the coping. " - Danny